Garmin GPSMAP 298C Owner's Manual - Page 89
Whiteline, Thermoclines, One of the unique features offered by Garmin is See-Thru
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Whiteline When the sonar sound waves are reflected back by the bottom, a hard bottom returns a stronger signal than a soft bottom. A thin whiteline indicates a softer bottom, while a thick whiteline indicates a harder bottom. Normally, a red line is used to show the point where water meets the bottom. This line follows the bottom contour, along with any significant objects lying on the bottom. The unit uses the whiteline function to make the bottom layer information easier to distinguish. These images show the Classic Black color scheme. USING SONAR > UNDERSTANDING SONAR Thermoclines A rough definition of a thermocline is a break in water where the water temperature changes faster than the water above it. Thermoclines are shown as the weakest colors. One of the unique features offered by Garmin is See-Thru® technology, which allows the GPSMAP 292/298 to hear both weak and strong signals simultaneously so as to identify fish returns under the toughest conditions, such as suspended in thermoclines or even hiding near structures. See-Thru technology allows the transducer to see through thermoclines and locate fish. This image is in the Classic Black color scheme Thick Whiteline: Hard bottom Whiteline On Whiteline Off GPSMAP 292/298 Owner's Manual Thermocline 83